Fix #179: add experimental setting to scale down or up UI size

backend/config.go

@@ -45,6 +45,7 @@ type AppConfig struct {
 	// Experimental - may be removed in future
 	FontNormalTTF string
 	FontBoldTTF   string
+	UIScaleSize   string
 }
 
 type AlbumPageConfig struct {
@@ -145,6 +146,7 @@ func DefaultConfig(appVersionTag string) *Config {
 			SettingsTab:         "General",
 			AllowMultiInstance:  false,
 			MaxImageCacheSizeMB: 50,
+			UIScaleSize:         "Normal",
 		},
 		AlbumPage: AlbumPageConfig{
 			TracklistColumns: []string{"Artist", "Time", "Plays", "Favorite", "Rating"},

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"log"
 	"math"
+	"os"
 	"runtime"
 	"time"
 
@@ -22,6 +23,12 @@ func main() {
 		log.Fatalf("fatal startup error: %v", err.Error())
 	}
 
+	if myApp.Config.Application.UIScaleSize == "Smaller" {
+		os.Setenv("FYNE_SCALE", "0.85")
+	} else if myApp.Config.Application.UIScaleSize == "Larger" {
+		os.Setenv("FYNE_SCALE", "1.1")
+	}
+
 	fyneApp := app.New()
 	fyneApp.SetIcon(res.ResAppicon256Png)
 

ui/dialogs/settingsdialog.go

@@ -406,9 +406,22 @@ func (s *SettingsDialog) createExperimentalTab(window fyne.Window) *container.Ta
 		s.doChooseTTFFile(window, boldFontEntry)
 	})
 
+	uiScaleRadio := widget.NewRadioGroup([]string{"Smaller", "Normal", "Larger"}, func(choice string) {
+		s.config.Application.UIScaleSize = choice
+		s.setRestartRequired()
+	})
+	uiScaleRadio.Horizontal = true
+	if s.config.Application.UIScaleSize == "Smaller" || s.config.Application.UIScaleSize == "Larger" {
+		uiScaleRadio.Selected = s.config.Application.UIScaleSize
+	} else {
+		uiScaleRadio.Selected = "Normal"
+	}
 	return container.NewTabItem("Experimental", container.NewVBox(
 		warningLabel,
 		s.newSectionSeparator(),
+		widget.NewRichText(&widget.TextSegment{Text: "UI Scaling", Style: boldStyle}),
+		uiScaleRadio,
+		s.newSectionSeparator(),
 		widget.NewRichText(&widget.TextSegment{Text: "Application Font", Style: boldStyle}),
 		container.New(layout.NewFormLayout(),
 			widget.NewLabel("Normal font"), container.NewBorder(nil, nil, nil, normalFontBrowse, normalFontEntry),